Years ago one of the Health Directors of Quebec appeared as a witness the same day as Langmann. The Health Director's speech raised all the usual anti talking points, even citing a couple of studies. When questioned, he said he hadn't read the studies he'd mentioned, but would read them later that month. (Expert Witness?)

we referred to research that had been conducted mainly by the Institut national de santé publique, which did that as part of a brief submitted to the House of Commons Standing Committee on a previous bill, Bill C-391.
...
I cannot tell you about it in detail, but we trust the institute's work.
-- Dr. Jean-Pierre Trépanier, Regional Director, Directeurs de santé publique du Québec (Lanaudière); SECU March 28 2012, re Bill C-19 ending LGR

He repeated Étienne Blais's study's wrong conclusion that the Firearms Act had saved 500 lives since 1999 due to the reduction in suicide.

“Some scientists claim that hydrogen, because it is so plentiful, is the basic building block of the universe. I dispute that. I say there is more stupidity than hydrogen, and that is the basic building block of the universe.”

Recommendations
Given the above, Quebec’s public health directors applaud the bill for making the criteria for
granting a licence more strict and increasing firearms traceability. But that is not enough. The
following are the most important improvements necessary:

1) apply the obligation to retain proof of sale to firearms sales and transfers between
individuals;
2) centralize proofs of sale or transfer in a national database so that police officers can
consult them rapidly;
3) seriously reconsider re-establishing a national registry that includes long guns; and
4) prohibit to the extent possible access to assault rifles for recreational purposes.

In Quebec, it is estimated that nearly one third of firearms sales take place between
individuals.14 We believe that a measure to require not only businesses, but also individuals to
retain proof of sale or transfer of firearms is appropriate. This would enable the creation of a
traceability index and ensure that the seller carefully verifies that the buyer has a valid licence
at the time the firearm is transferred, as proposed in Bill C-71.

If a national registry for nonrestricted
firearms is not created, police forces should, at a minimum, have quick and easy
access to proofs of sale when responding to real or suspected crisis situations.